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로울 드래프트에서의 슬라이버 동적거동의 동정 (I)-동적모델의 구조확인-
허유,우제린,Huh, You,Woo, Jae-Lin 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.7
The drawing process in staple yarn manufacturing has the object to increase the regularity of sliver linear density on the basis of the probability by doubling and to improve the orientation of fibers along the sliver axis. This process plays an important role in the quality of the spun yam, because the drawn sliver has no more opportunity to improve the regularity in the next processes in spinning. Therefore new drawing frames are equipped with automatic sliver irregularity control system which is called autoleveller. But an optimal control needs the dynamic characteristics which can be expressed in the form of a mathematical model. For identification of dynamic characteristics, the structure of the model must be known. In this study, it is attempted to ascertain the structure of the mathematical model of the dynamic characteristics of drawing which is not revealed yet. As results can be shown that 1) for the on-line measurement of the sliver irregularity, a leafspring with strain gauge has functioned electively, 2) the characteristics of the output sliver linear density for the input sliver could be expressed in the form of a proportional derivative system with time delay of the 1st order, where the behavior of the output sliver linear density to the draft ratio change in the form of a proportional system with time delay of the 1st order.
김지욱,류운영,우제린 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.12
One of the most important factor for the comfort of the passenger vehicles is the minimization of the compressible transmissibility during the running vehicles. Seat foam materials of 12 series (index 95 and the contents of isocyanate TDI was changed in percentages 75, 70, 65, 60, 50, 40) and D1 series (density 50 kg/㎥, index was changed 100, 95, 90) showed the significant differences in their transmissibility depended upon their chemical constitution such as index and contents of isocyanate TDI. The minimum transmissibility of seat foam materials of 12 series was found from the materials with the contents of 65% isocyanate TDI and the index 95 from the materials with the contents of 65% isocyanate TDI and index 95 at the frequency 4.79~5.31 Hz. Also the minimum transmissibility of seat foam materials of Dl series was found from the materials with the index90 and the density of 50 kg/㎥ at the frequency of 4.79~5.31 Hz.
제직시스템에서의 속도변화에 대한 위사밀도의 동적 응답 (I)
허유,류운영,우제린,Huh, You,Ryu, Woon-Young,Woo, Jae-Lin 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.11
Factors affecting fabric quality are yarn, weaving machine and men. Among them the weaving machine and men can be controlled in the weaving Process. Most of fabric defects result from the yarn, the weak points of which cause the discontinuities in the machine operation responsible for the endbreakages. The interruption in production can be reduced by an optimal operation of weaving machines, but the cause of endbreakages can not be completely eliminated. The places where the machine stopped and restarted leave streaks on the fabrics, which result in the fabric defects. These defects, so called stop marks, lead to the irregularity of weft density This paper deals with relationship between the change in weft density and the weaving interruption. The weft density change, the stop mark, was measured in terms of pickspacing and the mode of weaving interruption determined by applying different forms of speed variations. The results show that the weft density change is mostly influenced by the rate of speed variation. The initial loading on the warp yarns is independent of the total weft density change, but it is responsible for the distribution of the weft density irregularity.
장력 On-line계측의 사절 현상 해석에의 응용-단경사 장력 최대치의 분포-
김선욱,허유,우제린,Kim, Sun-Wook,Huh, You,Woo, Jae-Lin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.12
The yarn tension during weaving process has a significant influence on the product quality and production efficiency of woven fabric. On considering the yarn breakage rate in weaving, the analysis and prediction of yarn tension are very important. Pattern of variation in warp tension, at a given location on loom, with time under a certain specific boundary condition provides a vital piece of information for the analysis of yarn breakage rates. In the present work, variation in yarn tension was measured on a group of warp during weaving, and an attempt was made to extract some information on the variation of the extreme tension acting on the single warp yarns from the experimental results. From the experiments and loading model for a yarn group, it can be concluded that the ergodicity of warp yarn tension in weaving process is unlikely to be valid. The tension peak with respect to time has the characteristics of the normal distribution, while the tension on the ensemble basis has shown to be the Weibull distibution.
구성섬유와 그 형태특성이 집합체의 동적압축거동에 미치는 영향
최경희,류운영,우제린,Choe, Gyeong-Hui,Ryu, Un-Yeong,U, Je-Rin 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.9
This study describes the effects of some fiber types and geometrical characteristics on the dynamic compressive behavior of fiber assemblies. 15-gram specimens of fiber masses were compressed dynamically by means of a piston-cylinder device connected to a scotch yoke mechanism. Compression was carried out under LATIN SQUARE design with 5 replications and the identical runs were repeated at 6 different frequencies setting : 0.1, 0.5, 1.25, 2.5, 5 and 10Hz. Modelling fiber mass as a simple spring-mass-damper system, the stiffness coefficient k and viscosity coefficient c of the model were estimated from the obtained experimental values of amplitude ratios and phase angles. The effects of physical and dimensional properties of fibers on dynamic compressional properties were found as follows. 1. The effects of the fiber types on the values k and c is statistically significant at 1% level. And these values are larger for the acryl fiber, followed by polyester and nylon in this order. 2. The effect of the fiber fineness is statistically significant at 1% level. It was shown that the greater fiber fineness, the larger k and c values is. 3. The effect of crimp is statistically significant at 5% level.
섬유집합체의 압축에 관한 연구 -압축거동의 주파수 의존성-
이병철,류운영,우제린,Lee, Byeong-Cheol,Ryu, Un-Yeong,U, Je-Rin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.5
This thesis describes effects of input frequency and fibre type on the dynamic compressive behaviour of fibre assemblies. Frequency response measurements on the fibre of four fiber types were carried out at six different frequencies by means of a piston-cylinder device connected to a scotch yoke mechanism. 1. The order in which the peak pressure lines place themselves depends on the fibre types and input frequencies. 2. Under repetitive compression, the observed variation in the peak response level indicates that regardless of the fibre type on orderless fibre mass posess a frequency (turn around frequency in this thesis) at which the peak pressure response level reaches a maximum.
Weight- biased 표본에 의한 섬유직경의 변동측정 (III) -합성섬유의 직경의 분산추정-
박창혁,노정익,우제린,Park, Chang-Hyeok,No, Jeong-Ik,U, Je-Rin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.7
The inferiority of the variance estimates of synthetic staple fibre diameter when compared to those from the wool tops implies that a special calibration of air flow apparatus is required for synthetic staple fibres. The rapidity and accuracy in the determination of the fibre diameter variance estimate are the main features of the methods developed in this study. Additional work is desirable to provide and improved stream of input fibres to the throwing device.